ExactlyThe whole magazine of rimfire ammo exploding is not plausible at all.
Case failure, (a badly ruptured case) can do a lot of damage...
When I was setting up my T1x with an aftermarket barrel I had an excessive headspace - used a gauge to set it up but apparently made an error doing it. Fired just fine with SV ammo.
I then put in some HV to test and blammo
Bolt was fully closed, the case separated at the rim. The force blew the (plastic) magazine apart with the remaining rounds going everywhere along with the mag bits (down from the receiver and hitting the table and gone). The bullet exited the barrel.
Big surprise that's for sure.....